標題: Angular and energy dependences of the surface excitation parameter for electrons crossing a solid surface
作者: Kwei, C. M.
Li, Y. C.
Tung, C. J.
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
關鍵字: electron;surface excitation parameter;glancing angle
公開日期: 15-Sep-2006
摘要: When fast electrons cross a solid surface, surface plasmons may be generated. Surface plasmon excitations induced by electrons moving in the vacuum are generally characterized by the surface excitation parameter. This parameter was calculated for 200-1000 eV electrons crossing the surfaces of An, Cu, Ag, Fe, Si, Ni, Pd, MgO and SiO, with various crossing angles. Such calculations were performed based on the dielectric response theory for both incident (from vacuum to solid) and escaping (from solid to vacuum) electrons. Calculated results showed that the surface excitation parameter increased with crossing angle but decreased with electron energy. This was due to the longer time for electron-surface interaction by glancing incident or escaping electrons and by slow moving electrons. The results were fitted very well to a simple formula, i.e. P-s = aE(-b)/(cosx)(c), where P, is the surface excitation parameter, E is the electron energy, alpha is the angle between the electron trajectory and the surface normal, and a, b and c are material dependent constants. (c) 2006 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.susc.2006.01.071
http://hdl.handle.net/11536/11771
ISSN: 0039-6028
DOI: 10.1016/j.susc.2006.01.071
期刊: SURFACE SCIENCE
Volume: 600
Issue: 18
起始頁: 3690
結束頁: 3694
Appears in Collections:Conferences Paper


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